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参数资料
| 型号： | LTC3809IMSE-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 9/24页 |
| 文件大小： | 256K |
| 代理商： | LTC3809IMSE-1 |
LTC3809-1
17
38091fc
For coincident tracking (VOUT = VX during start-up),
RTA = RA, RTB = RB
VX should always be greater than VOUT when using the
tracking function of TRACK/SS pin.
The internal current source (1μA), which is for external
soft-start, will cause a tracking error at VOUT. For example,
if a 59k resistor is chosen for RTA, the RTA current will be
about 10μA (600mV/59k). In this case, the 1μA internal
current source will cause about 10% (1μA/10μA 100%)
tracking error, which is about 60mV (600mV 10%)
referred to VFB. This is acceptable for most applications.
If a better tracking accuracy is required, the value of RTA
should be reduced.
Table 1 summarizes the different states in which the
TRACK/SS can be used.
Table 1. The States of the TRACK/SS Pin
TRACK/SS Pin
FREQUENCY
Capacitor CSS
External Soft-Start
VIN
Internal Soft-Start
Resistor Divider
VOUT Tracking an External Voltage VX
APPLICATIONS INFORMATION
Auxiliary Winding Control Using the MODE Pin
The MODE pin can be used as an auxiliary feedback to
provide a means of regulating a yback winding output.
When this pin drops below its ground-referenced 0.4V
threshold, continuous mode operation is forced.
During continuous mode, current ows continuously in
the transformer primary side. The auxiliary winding draws
current only when the bottom synchronous N-channel
MOSFET is on. When primary load currents are low and/
or the VIN/VOUT ratio is close to unity, the synchronous
MOSFET may not be on for a sufcient amount of time to
transfer power from the output capacitor to the auxiliary
load. Forced continuous operation will support an auxiliary
winding as long as there is a sufcient synchronous
MOSFET duty factor. The MODE input pin removes
the requirement that power must be drawn from the
transformer primary side in order to extract power from
the auxiliary winding. With the loop in continuous mode,
the auxiliary output may nominally be loaded without
regard to the primary output load.
Figure 5b and 5c. Two Different Modes of Output Voltage Tracking
TIME
(5b) Coincident Tracking
VX
VOUT
OUTPUT
VOL
TAGE
TIME
38091 F05b,c
(5c) Ratiometric Tracking
VX
VOUT
OUTPUT
VOL
TAGE
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